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Table of Fungicide Effectiveness for Apple Diseases in Virginia, West Virginia, and Maryland |
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Table of Fungicide Effectiveness for Apple Diseases in Virginia, West Virginia, and Maryland |
Fungicide |
Rate per 100 gallon dilute |
Scab |
Powdery mildew |
Rusts |
Brooks spot |
Black rot |
White rot |
Bitter rot |
Sooty blotch/Flyspeck |
Bayleton 50DF |
1 oz. |
S |
E |
E |
S |
- |
- |
- |
- |
Benlate 50W + Captan 50W |
2 - 3 oz. + 1 lb. |
?1 |
G |
N |
E |
E |
E |
F |
E |
Benlate 50W + Mancozeb 75DF |
2 - 3 oz + 1 lb. |
?1 |
G |
F |
E |
G |
G |
G |
E |
Benlate 50W + Mancozeb 75DF + Superior oil |
2- 3 oz. + 1 lb. + 1 qt. |
?1 |
G |
F |
E |
G |
G |
G |
E |
Benlate 50W + Polyram 80DF |
2 - 3 oz. + 1 lb. |
?1 |
G |
F |
E |
G |
G |
G |
G |
Benlate 50W + Ziram 76DF or WDG |
2 - 3 oz. + 1 lb. |
?1 |
G |
F |
G |
G |
G |
F |
E |
Captan 50W |
2 lb. |
G |
N |
S |
G |
G |
G |
G |
G |
Captan 50W |
1.5 lb. |
G |
N |
S |
G |
G |
G |
F |
F |
Captan 50W + Ziram 76DF or WDG + Benlate 50W or Topsin-M 70W |
1 lb. + 1 lb. + 2 oz. or 2 oz. |
?1 |
G |
F |
E |
E |
E |
G - E |
E |
Dodine 65W |
8 oz. |
E |
N |
N |
F |
N |
N |
N |
F |
EBDC + Captan or Ziram 76DF or WDG |
1 lb. + 1 -2 lb. or 1 - 2 lb. |
G |
- |
G |
G |
G - E |
G - E |
E |
G - E |
Ferbam 76W |
2 lb. |
G |
N |
G |
G |
F |
F |
G - E |
F |
|
Flint 50WG |
2.0 oz./A |
E | G-E | F-G | G-E | ? | G | G(?) | E |
Mancozeb 75DF or equiv. |
1 lb. |
F |
N |
F |
G |
F |
F |
G |
G |
Nova 40W + Captan 50W |
1.25 + 1 lb. |
E |
E |
E |
F |
- |
- |
- |
- |
Nova 40W + Dodine 65W |
1.25 oz. + 4 oz |
E |
E |
E |
S |
- |
- |
- |
- |
Nova 40W + Mancozeb 75DF |
1.25 oz + 1 lb. |
E |
E |
E |
G |
- |
- |
- |
- |
Nova 40W + Polyram 80DF |
1.25 oz + 1 lb. |
E |
E |
E |
F |
- |
- |
- |
- |
Nova 40W + Ziram 76DF or WDG |
1.25 oz. + 1 lb. |
E |
E |
E |
F |
- |
- |
- |
- |
Polyram 80DF |
1 lb. |
F |
N |
F |
F |
F |
F |
G |
F |
| Procure 50WS + Captan 50W | 3 oz. + 1 lb. | E | G | G | F | - | - | - | - |
| Procure 50WS + mancozeb 75DF | 3 oz. + 1 lb. | E | G | E | G | - | - | - | - |
| Procure 50WS + Polyram 80DF | 3 oz. + 1 lb. | E | G | E | F | - | - | - | - |
| Procure 50WS + Ziram 76DF or WDG | 3 oz. + 1 lb. | E | G | E | F | - | - | - | - |
Rubigan 1E + Polyram 80W |
9 -12 fl. oz. + 3.25 lb. per acre |
E |
E |
G |
S |
- |
- |
- |
- |
Rubigan 1E + Captan 50W |
9 -12 fl. oz. + 3.25 lb. per acre |
E |
E |
G |
F |
- |
- |
- |
- |
Rubigan 1E + Dodine 65W |
9 -12 fl. oz. + 4 oz. per acre |
E |
E |
G |
S |
- |
- |
- |
- |
Rubigan 1E + Mancozeb 75DF |
9 -12 fl. oz. + 3.25 lb. per acre |
E |
E |
E |
G |
- |
- |
- |
- |
Rubigan 1E + Polyram 80DF |
9 -12 fl. oz. + 3.25 lb. per acre |
E |
E |
E |
F |
- |
- |
- |
- |
Rubigan 1E + Ziram 76DF or WDG |
9 -12 fl. oz. + 3.25 1 lb. per acre |
E |
E |
E |
F |
- |
- |
- |
- |
| Sovran 50WG | 4.0 oz./A | E | G-E | F-G | G-E | ? | G | G(?) | E |
Sulfur 95W |
2 - 3 lb. |
F |
G |
N |
N |
N |
N |
N |
S |
Sulfur 95W |
5 lb. |
G |
G |
N |
N |
N |
N |
N |
S |
Thiram 65W |
2 lb. |
F |
N |
F |
F |
F |
F |
G |
F |
Topsin-M 70W + Captan 50W |
2 - 3 oz. + 1 lb. |
?1 |
G |
N |
E |
E |
E |
F |
E |
Topsin-M 70W + Mancozeb 75DF |
2 - 3 oz. + 1 lb. |
?1 |
G |
F |
E |
G |
G |
G |
G |
Topsin-M 70W + Ployram 80DF |
2 - 3 oz. + 1 lb. |
?1 |
G |
F |
E |
G |
G |
G |
G |
Topsin-M 70W + Ziram 76DF or WDG |
2 - 3 oz. + 1 lb. |
?1 |
G |
F |
G |
G |
G |
F |
E |
| Vangard 75WG + mancozeb 75DF | 3 oz./A + 3 lb./A | G | N |
F |
- | - | - | - | - |
Ziram 76DF or WDG |
2 lb. |
F - G2 |
N |
G |
G |
F |
F |
G |
G |
Rating scale: E = excellent, generally good disease control under heavy disease pressure; G = good, good control under moderate disease pressure; F = fair, fair control under moderate disease pressure; S = slight, some control under light disease pressure; N = little or no effect on indicated disease; ? = information lacking or - not applicable.
Caution:
1 Combinations involving Benlate or Topsin-M have become ineffective where resistant strains of the apple scab fungus have developed. Resistance to Benlate or Topsin-M has been confirmed in the Virginia county of Botetourt, Clarke, Floyd, Frederick, Madison, Roanoke, Rockingham, Shenandoah, Warren, Wise, and Smith, and West Virginia. If resistance is suspected, use of Benlate or Topsin-M should be discontinued and replaced by full rates of other scab fungicides. Dodine will become less effective where resistance occurs. Scab resistance to Dodine has been confirmed in Clarke and Warren counties, Virginia.
Effectiveness ratings of fruit fungicides for disease control are based on research at Winchester, Virginia, and Kearneysville, West Virginia, and also on research from surrounding states. The ratings also are based on severe disease pressures at the test sites. Although the ratings are compiled from the results of 5 to 10 years of research, they may not hold true for all orchard conditions within Virginia, West Virginia, and Maryland. Results can vary by location depending upon the weather conditions, how well trees were sprayed the previous year, concentration of disease inoculum in orchards, tree size and age, formulation of a given fungicide, and how the fungicide was applied (high or low volume). Under certain environmental and cultural practice, the effectiveness ratings could change from good to excellent or vice versa. The ratings, however, are intended as a general guide to assist the grower in fungicide selection for disease control.
2 Ziram may be less effective than captan on apple cultivars that are more susceptible to scab.
3 Procure at 8-12 oz/acre may be combined with standard protectant fungicides for improved broad spectrum disease control, improved fruit scab control, and to offset the development of resistance to sterol-inhibiting fungicides.
Credits: Table of fungicide effectiveness from the 2001 Va./W.Va./Md. Spray Bulletin for Commercial Fruit Growers, table compiled by K. S. Yoder and A. R. Biggs.
02/15/2001
